236 
Sir Everard Home on 
lies behind the duodenum, loosely connected to it by cellular 
membrane ; at its lower end it projects like an os tincae into 
the gut. This proves not to be the common opening of a 
ductus communis choledochus, but a canal leading directly 
from a large oval cavity with thick strong coats, by no means 
unlike those of the urinary bladder in a thickened state. 
These parts are shown in Plate VII. half the natural size. 
This cavity is supplied with bile laterally by a single duct 
from the liver. 
This mode of supplying the duodenum with bile, differs 
from what is met with in all the animals I have had an 
opportunity of examining ; and what is highly satisfactory, 
some of the substances on which this animal feeds, are, I 
believe, almost wholly peculiar to itself. I am informed by my 
friend Mr. Fisher, who was Astronomer in the two last 
voyages, that he was present when the contents of a wal- 
ruses stomach was examined : they consisted entirely of the 
long branches of sea weed, Fucus digitatus, which is very 
abundant in the Arctic seas, especially in those parts of them 
where the walrus is met with in the greatest numbers. One 
of the seamen said it made him sick to look at the half di- 
gested sea weed contained in one of the stomachs. This sea 
weed, when the sea is open, is thrown up in great quantities 
on the beach, and when the sea is frozen, is found in masses 
under the ice. 
The mucus secreted by the coats of the gall bladder, which 
in general is so small as to be of no consideration, in this 
animal is so abundant, as to induce me to consider it a neces- 
sary ingredient to the bile with which it is mixed. 
The third new "fact, with an account of which I shall con- 
